小编Rom*_*man的帖子

通过brew cask install virtualbox我安装Virtualbox时出现以下错误:

==> Satisfying dependencies
==> Downloading http://download.virtualbox.org/virtualbox/5.1.28/VirtualBox-5.1.28-117968-OSX.dmg
Already downloaded: /Users/romanderlemenko/Library/Caches/Homebrew/Cask/virtualbox--5.1.28-117968.dmg
==> Verifying checksum for Cask virtualbox
==> Installing Cask virtualbox
==> Running installer for virtualbox; your password may be necessary.
==> Package installers may write to any location; options such as --appdir are ignored.
Password:
==> installer: Package name is Oracle VM VirtualBox
==> installer: Installing at base path /
==> installer: The install failed (The Installer encountered an error that caused the installation to …

所以,例如,如果我在WFA中有2个文本框.以下代码有效.

private void textBox1_TextChanged(object sender, EventArgs e)
    {
        textBox2.Text = textBox1.Text;
    }

我明白了.当我更改它时,第二个文本框中的文本等于第一个文本框中的文本.

但是当谈到WPF时,我会得到完全不同的行为.当我这样做.

private void textBox_TextChanged(object sender, TextChangedEventArgs e)
    {
        textBox1.Text = textBox.Text;
    }

然后按Ctrl + F5测试应用程序,没有任何反应.日志显示"Build Succeeded"并没有.这有什么不对？

这是XAML代码.

    <Window x:Class="TextBoxTest.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    xmlns:local="clr-namespace:TextBoxTest"
    mc:Ignorable="d"
    Title="MainWindow" Height="350" Width="525">
<Grid>
    <TextBox x:Name="textBox" HorizontalAlignment="Left" Height="23" Margin="212,77,0,0" TextWrapping="Wrap" Text="TextBox" VerticalAlignment="Top" Width="120" TextChanged="textBox_TextChanged"/>
    <TextBox x:Name="textBox1" HorizontalAlignment="Left" Height="23" Margin="212,124,0,0" TextWrapping="Wrap" Text="TextBox" VerticalAlignment="Top" Width="120"/>

</Grid>

我很确定这之间没有区别

if ($value === true)

还有这个

if (true === $value)

对我来说,它总是令人困惑.我曾经认为这是一种"非常规的新开发者风格".此外,我的老板告诉我永远不要做这样的事情.

但今天我正在浏览Slim的源代码,由创建PHP的人编写:正确的方法,并看到了这一点 (第341行).

if (true === $value) {
    $c['settings'] = array_merge_recursive($c['settings'], $name);
}

我敢肯定像Josh Lockhart这样的人如果被认为是一种不好的做法就不会做这样的事情.这个订单怎么样？这是一种古老的传统吗？